Custom field problem (1 post)

I'm having a problem using custom fields on WordPress on the url http://www.gift-giving-guide.com. I'm currently using a few plugins to help out with custom fields: Coffee 2 Code's Get Custom Field Values, Rhymed Code's Custom Field GUI, Bunny's Technorati Tags, and the keywords plugin. These plugins are to get the featured product information, price and location as well as technorati tags and keywords. Problem is, we keep losing some of the custom field content--is there a limit on custom fields per post? If so, how can I circumvent that? Or is it something else?